NEONATAL AND INFANTILE PULMONARY HEMORRHAGE - AN AUTOPSY STUDY WITH CLINICAL CORRELATION

We studied the clinicopathologic features of pulmonary hemorrhage in a utopsied infants less than 1 year of age for a 12-month period. There were 70 liveborns (LB) and 24 stillborns (SB). The percentage of LB wi th pulmonary hemorrhage (PH), pulmonary interstitial emphysema (PIE), hyaline membrane disease (HMD), acute bronchopneumonia (ABP), congenit al malformations (CM), and surgery (SUR) were analyzed according to we eks of estimated gestational age (EGA) and as an entire group. Overall , 74% of LB and 24% of SB had histologic evidence of PH. A semiquantit ative evaluation of the extent of PH among the LB infants disclosed th at hemorrhage involved less than one-third of the observed lung tissue in 42%, one-third to two-thirds of the lung was hemorrhagic in 15%, a nd the remaining 42% had more than two-thirds hemorrhagic lung parench yma. A total of 31 clinical and pathologic factors were evaluated for their possible association or relationship to PH. Statistical analysis revealed that hyaline membranes and hemorrhage in other extrapulmonar y sites were the only significant associations with PH. PH was more fr equent in premature infants born between 24 and 39 weeks EGA and was a lways associated with multiple other conditions. Although the autopsy finding of hemorrhage in the lungs is relatively frequent in the popul ation we studied, it appears that PH as a primary phenomenon in infant s is extremely rare, if it occurs at all.